Concept:Rhyme scheme is the pattern of end sounds in the lines of a stanza.Explanation:Line 1 ends with “pressure” → label it a.Line 2 ends with “strong” → label it b.Line 3 ends with “strong” → it also has label b.In the four-line stanza, the fourth line rhymes with “pressure,” so it is label a.The pattern is therefore abba.Answer:A. abba